usr.sbin/jls/jls.c

   1 /*-
   2  * Copyright (c) 2003 Mike Barcroft <mike@FreeBSD.org>
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  *
  26  * $FreeBSD: src/usr.sbin/jls/jls.c,v 1.3 2003/04/22 13:24:56 mike Exp $
  27  * $DragonFly: src/usr.sbin/jls/jls.c,v 1.2 2006/12/29 18:02:57 victor Exp $
  28  */
  29
  30 #include <sys/param.h>
  31 #include <sys/sysctl.h>
  32
  33 #include <err.h>
  34 #include <errno.h>
  35 #include <limits.h>
  36 #include <stdio.h>
  37 #include <stdlib.h>
  38 #include <string.h>
  39
  40 #include <netinet/in.h>
  41 #include <arpa/inet.h>
  42
  43 int
  44 main(void)
  45 {
  46         size_t len, i;
  47         char *jls; /* Jail list */
  48         char *curpos;
  49
  50         if (sysctlbyname("jail.list", NULL, &len, NULL, 0) == -1)
  51                 err(1, "sysctlbyname(): jail.list");
  52 retry:
  53         if (len == 0)
  54                 exit(0);
  55
  56         jls = malloc(len);
  57         if (jls == NULL)
  58                 err(1, "malloc failed");
  59
  60         if (sysctlbyname("jail.list", jls, &len, NULL, 0) == -1) {
  61                 if (errno == ENOMEM) {
  62                         free(jls);
  63                         goto retry;
  64                 }
  65                 err(1, "sysctlbyname(): jail.list");
  66         }
  67         printf("JID\tHostname\tPath\tIPs\n");
  68         curpos = jls;
  69         do {
  70                 for (i = 0; i < 3; i++) {
  71                         curpos = strchr(curpos, ' ');
  72                         *curpos = '\t';
  73                 }
  74         } while ( (curpos = strchr(curpos, '\n')) != NULL);
  75         printf("%s\n", jls);
  76         free(jls);
  77         exit(0);
  78 }